Jet ski



FIG. 1 is a front perspective view of a jet ski showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side view being a mirror image of that shown; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a jet ski, as shown and described. 